/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "xpcprivate.h"
#include "XPCWrapper.h"
#include "WrapperFactory.h"
#include "AccessCheck.h"

using namespace xpc;
using namespace mozilla;

namespace XPCNativeWrapper {

static inline
bool
ThrowException(nsresult ex, JSContext* cx)
{
  XPCThrower::Throw(ex, cx);

  return false;
}

static bool
UnwrapNW(JSContext* cx, unsigned argc, jsval* vp)
{
  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
  if (args.length() != 1) {
    return ThrowException(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx);
  }

  JS::RootedValue v(cx, args[0]);
  if (!v.isObject() || !js::IsWrapper(&v.toObject())) {
    args.rval().set(v);
    return true;
  }

  if (AccessCheck::wrapperSubsumes(&v.toObject())) {
    bool ok = xpc::WrapperFactory::WaiveXrayAndWrap(cx, &v);
    NS_ENSURE_TRUE(ok, false);
  }

  args.rval().set(v);
  return true;
}

static bool
XrayWrapperConstructor(JSContext* cx, unsigned argc, jsval* vp)
{
  JS::CallArgs args = CallArgsFromVp(argc, vp);
  if (args.length() == 0) {
    return ThrowException(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx);
  }

  if (!args[0].isObject()) {
    args.rval().set(args[0]);
    return true;
  }

  args.rval().setObject(*js::UncheckedUnwrap(&args[0].toObject()));
  return JS_WrapValue(cx, args.rval());
}
// static
bool
AttachNewConstructorObject(JSContext* aCx, JS::HandleObject aGlobalObject)
{
  // Pushing a JSContext calls ActivateDebugger which calls this function, so
  // we can't use an AutoJSContext here until JSD is gone.
  JSAutoCompartment ac(aCx, aGlobalObject);
  JSFunction* xpcnativewrapper =
    JS_DefineFunction(aCx, aGlobalObject, "XPCNativeWrapper",
                      XrayWrapperConstructor, 1,
                      JSPROP_READONLY | JSPROP_PERMANENT | JSFUN_STUB_GSOPS | JSFUN_CONSTRUCTOR);
  if (!xpcnativewrapper) {
    return false;
  }
  JS::RootedObject obj(aCx, JS_GetFunctionObject(xpcnativewrapper));
  return JS_DefineFunction(aCx, obj, "unwrap", UnwrapNW, 1,
                           JSPROP_READONLY | JSPROP_PERMANENT) != nullptr;
}

} // namespace XPCNativeWrapper

namespace XPCWrapper {

JSObject*
UnsafeUnwrapSecurityWrapper(JSObject* obj)
{
  if (js::IsProxy(obj)) {
    return js::UncheckedUnwrap(obj);
  }

  return obj;
}

} // namespace XPCWrapper